Effects of optical-density and phase dispersion of an imperfect band-limited occulting mask on the broadband performance of a TPF coronagraph

Details Effects of optical-density and phase dispersion of an imperfect band-limited occulting mask on the broadband performance of a TPF coronagraph Effects of optical-density and phase dispersion of an imperfect band-limited occulting mask on the broadband performance of a TPF coronagraph

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007spie.6693e..40s&link_type=abstract

Techniques and Instrumentation for Detection of Exoplanets III. Edited by Coulter, Daniel R. Proceedings of the SPIE, Volume 66

Computer Science

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Scientific paper

Practical image-plane occulting masks required by high-contrast imaging systems such as the TPF-Coronagraph introduce phase errors into the transmitting beam, or, equivalently, diffract the residual starlight into the area of the final image plane used for detecting exo-planets. Our group at JPL has recently proposed spatially profiled metal masks that can be designed to have zero parasitic phases at the center wavelength of the incoming broadband light with small amounts of OD and phase dispersions at other wavelengths. Work is currently underway to design, fabricate and characterize such image-plane masks. In order to gain some understanding on the behaviors of these new imperfect band-limited occulting masks and clarify how such masks utilizing different metals or alloys compare with each other, we carried out some modeling and simulations on the contrast performance of the high-contrast imaging testbed (HCIT) at JPL. In this paper we describe the details of our simulations and present our results.

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